sigma-rules/rules/ml/discovery_ml_linux_system_user_discovery.toml

[metadata]
creation_date = "2020/09/03"
integration = ["auditd_manager", "endpoint"]
maturity = "production"
updated_date = "2023/07/27"
min_stack_comments = "New fields added: required_fields, related_integrations, setup"
min_stack_version = "8.3.0"

[rule]
anomaly_threshold = 75
author = ["Elastic"]
description = """
Looks for commands related to system user or owner discovery from an unusual user context. This can be due to uncommon
troubleshooting activity or due to a compromised account. A compromised account may be used to engage in system owner or
user discovery in order to identify currently active or primary users of a system. This may be a precursor to additional
discovery, credential dumping or privilege elevation activity.
"""
false_positives = [
    """
    Uncommon user command activity can be due to an engineer logging onto a server instance in order to perform manual
    troubleshooting or reconfiguration.
    """,
]
from = "now-45m"
interval = "15m"
license = "Elastic License v2"
machine_learning_job_id = ["v3_linux_system_user_discovery"]
name = "Unusual Linux User Discovery Activity"
risk_score = 21
rule_id = "59756272-1998-4b8c-be14-e287035c4d10"
severity = "low"
tags = ["Domain: Endpoint", "OS: Linux", "Use Case: Threat Detection", "Rule Type: ML", "Rule Type: Machine Learning", "Tactic: Discovery"]
type = "machine_learning"
[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1033"
name = "System Owner/User Discovery"
reference = "https://attack.mitre.org/techniques/T1033/"


[rule.threat.tactic]
id = "TA0007"
name = "Discovery"
reference = "https://attack.mitre.org/tactics/TA0007/"